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Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 396,871 $ 396,269
Unamortized debt premium 1,989 2,395
Debt issuance cost (5,324) (6,425)
Less: current maturities (124) (253)
Long-term debt 396,747 396,016
Senior unsecured notes due October 2021    
Debt Instrument [Line Items]    
Total debt 400,000 400,000
Senior secured revolving credit facility    
Debt Instrument [Line Items]    
Total debt 0 0
Other debt    
Debt Instrument [Line Items]    
Total debt $ 206 $ 299